[iStudyCampus]

I'm not sure if this will be any easier but this is how my Japanese teacher taught my class (I'm a native speaker but I went to an international school so we spent much less time studying Japanese grammar compared to what I expect Kirakira san did).

for all types of verbs, you first learn the endings in this order
1. negative form: ends with -nai
2. ends with -masu
3. the verb form found in a dictionary
4. supposition form: ending in -ba for godan verbs, -reba for ichidan verbs
5. command form: E column (-e, -ke, -se,...,-re) for godan verbs, -ro for ichidan verbs
6. ends in -u for godan, -you for ichidan verbs

GODAN VERBS (all verbs that aren't ichidan or irregular verbs):
example 書く　（かく）
1. kaKA-nai
2. kaKI-masu
3. kaKU
4. kaKE-ba
5. kaKE
6. kaKO-u
for godan verbs with A group (A I U E O) conjugation, for example 買う　（かう）, A changes to WA (1. kaWA-nai)

ICHIDAN VERBS (verbs with the dictionary form end with -iru or -eru)
example: 見る（みる） & 食べる（たべる）
1. mi-nai; tabe-nai
2. mi-masu; tabe-masu
3. mi-ru; tabe-ru
4. mi-reba; tabe-reba
5. mi-ro; tabe-ro
6. mi-you; tabe-you

I suggest you just memorize the irregular verb conjugation since it's only two verbs (kuru and suru).

and then there's the -ta and -te forms but I'll skip those for now